linux-kernel - Re: [PATCH 5/5] hwspinlock/core: call pm_runtime_put in pm_runtime_get

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Message-ID: <CAK=WgbbDhfLa1uQn3v0Lu5iOLL5QgGxKuOVrq9AKD9fLtb42FQ@mail.gmail.com>
Date:	Fri, 5 Apr 2013 09:27:40 +0300
From:	Ohad Ben-Cohen <ohad@...ery.com>
To:	Li Fei <fei.li@...el.com>
Cc:	"Rafael J. Wysocki" <rjw@...k.pl>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Chuansheng Liu <chuansheng.liu@...el.com>
Subject: Re: [PATCH 5/5] hwspinlock/core: call pm_runtime_put in
 pm_runtime_get_sync failed case

Hi Li,

On Thu, Feb 28, 2013 at 10:02 AM, Li Fei <fei.li@...el.com> wrote:
>
> Even in failed case of pm_runtime_get_sync, the usage_count
> is incremented. In order to keep the usage_count with correct
> value and runtime power management to behave correctly, call
> pm_runtime_put(_sync) in such case.

Is it better then to call pm_runtime_put_noidle instead? This way
we're sure to only take care of usage_count without ever calling any
underlying pm handler.

Thanks,
Ohad.

> In __hwspin_lock_request, module_put is also called before
> return in pm_runtime_get_sync failed case.
>
> Signed-off-by Liu Chuansheng <chuansheng.liu@...el.com>
> Signed-off-by: Li Fei <fei.li@...el.com>
> ---
>  drivers/hwspinlock/hwspinlock_core.c |    2 ++
>  1 files changed, 2 insertions(+), 0 deletions(-)
>
> diff --git a/drivers/hwspinlock/hwspinlock_core.c b/drivers/hwspinlock/hwspinlock_core.c
> index db713c0..5a5076d 100644
> --- a/drivers/hwspinlock/hwspinlock_core.c
> +++ b/drivers/hwspinlock/hwspinlock_core.c
> @@ -416,6 +416,8 @@ static int __hwspin_lock_request(struct hwspinlock *hwlock)
>         ret = pm_runtime_get_sync(dev);
>         if (ret < 0) {
>                 dev_err(dev, "%s: can't power on device\n", __func__);
> +               pm_runtime_put(dev);
> +               module_put(dev->driver->owner);
>                 return ret;
>         }
>
> --
> 1.7.4.1
>
>
>
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